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Other Assets (Details) - USD ($)
$ in Millions
Dec. 07, 2015
May 31, 2016
Investments in and Advances to Affiliates [Line Items]    
Purchase of non-transferable warrants $ 2.0  
Contingent consideration   $ 4.0
Warrant    
Investments in and Advances to Affiliates [Line Items]    
Contingent consideration   $ 5.0